37, motel handyman, confessed to the July killing of a 26-year-old Yosemite National Park naturalist, Joie Ruth Armstrong, and the February massacre of three sight-seers, Carole Sund, 42; her daughter, Juli Sund, 15; and Silvina Pelossa, a 16-year-old foreign-exchange student from Argentina. All four murders occurred in or near Yosemite. Stayner was charged with the murder of Armstrong, while authorities continue to investigate the other deaths. Stayner said he fantasized about killing women and was driven to murder by voices in his head.